LiTi2(PO4)3/C 复合材料的制备及电化学性能

doi:10.3866/PKU.WHXB201203012

Abstract

Abstract: LiTi₂(PO₄)₃/C composite with a Na⁺ superionic conductor (NASICON)-type structure was prepared by a sol-gel method. The LiTi₂(PO₄)₃/C composite had a good NASICON structure and good electrochemical properties as revealed by X-ray diffraction (XRD), scanning electron microscopy (SEM), charging/discharging tests, cyclic voltammetry (CV), and electrochemical impedance spectroscopy (EIS). The first discharge capacity was 144 mAh·g^-1. The EIS results indicated that there appeared semicircles respectively representing the solid electrolyte interface (SEI) film as well as the contact resistance, charge transfer resistance, and phase transformation resistance in the initial lithiation process of LiTi₂(PO₄)₃/C composite electrode. The chemical diffusion coefficients of intercalation and de-intercalation of Li⁺ in the LiTi₂(PO₄)₃ cathode material were calculated to be 2.40×10^-5 and 1.07×10^-5 cm²·s^-1, respectively.

Key words: LiTi₂(PO₄)₃/C composite material, Electrochemical impedance spectroscopy, Solid electrolyte interface film, Contact resistance, Phase transformation, Diffusion coefficient

YUAN Zheng, CUI Yong-Li, SHEN Ming-Fang, QIANG Ying-Huai, ZHUANG Quan-Chao. Preparation and Electrochemical Performance of LiTi₂(PO₄)₃/C Composite Cathode for Lithium Ion Batteries[J]. Acta Phys. -Chim. Sin. 2012, 28(05), 1169-1176. doi: 10.3866/PKU.WHXB201203012

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Preparation and Electrochemical Performance of LiTi₂(PO₄)₃/C Composite Cathode for Lithium Ion Batteries

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Preparation and Electrochemical Performance of LiTi₂(PO₄)₃/C Composite Cathode for Lithium Ion Batteries